Isosceles Triangle Theorem - if two sides of a triangle are congruent, then the angles opposite those sides are congruent.

Converse of Isosceles Theorem - If two angles of a triangle are congruent, then the sides opposite those angles are congruent.

Corollary - Each angle of an equilateral triangle is 60 degrees.

Corollary - The bisector of the vertex of an angle of an isoceles triangle is the perpendicular bisector of the base.

CPCTC - Corresponding Parts of Congruent Triangles are Congruent.
An Isosceles triangle is a triangle with at elast two congruent sides.
SAS (side angle side)- states that if 2 triangles have a two sides and an angle are congruent
external image identify_ASA.jpg

Isocsceles Triangle Theorem: IF two sides of a triangle are congruent, then the angles oposite those sides are congruent.

Coverse of the Isosceles Triangle Theorem: If two angles of a triangle are congruent,then the sides opposite those angles are congruent